So random, yet so many possible combinations, and a lot of them make sense, or connections could be somehow explained. However, I've chosen few to comment
Real Business:
Green Office Business - sure is a concept, but not really a business. Perhaps a business can be run that helps other companies run their offices with a more sustainable supplies or, i.e., cut down on the usage of paper (print less mails, since it is borderline unnecessary anyway)
Edit: There is such a similar company https://www.thegreenoffice.com/ that supplies offices with eco-friendly merchandise.
Solar Charger Business - there are many producers out there already, but the chargers are pricey (in comparison to the standard ones)...
Recycle Machine Business - those exist, so whoever makes them, is in business.
Renewable Battery Business - same, at least when thinking of those chargers for batteries that are possible to recharge.
Imagined Business
Biodegradable Battery Business - there is some research on it, but it is so far away that it basically makes it imaginary. Managing batteries after they are depleted is complicated by the fact that you have to separate it from any other kind of waste, so inventing a battery concept that would be biodegradable would sure be a huge and profitable innovation.
